Rifled projectile fuzes with head pin bolt



RIFLED PROJECTILE FUZES WITH HEAD PIN BOLT Filed Feb. 15, 1967 5 Sheets-Sheet l Fig.7

l 130 :ii gr I 18 a I y i a R mfi fl Jan. 13, 1970 P. KAISER 3,4 9

RIFLED PROJECTILE FUZES WITH HEAD PIN BOLT Filed Feb. 15; 1967 3 Sheets-Sheet 2 INVENTORs P. 036!- I W Its-quite:-

Jan. 13, 1970 P. KAISER ET AL 3,489,089

RIFLEDPROJECTILE FUZES WITH HEAD PIN BOLT Filed Feb. 15, 1967 3 Sheets-Sheet 5 I Fig. 4 3 7 5 g; 10s A 41 5a mama lzki'hn IN V EN TORS' 5 WWW United States Patent rm. (:1. F42c 35/22, 15/24 US. (:1. 1o2 79 Claims ABSTRACT OF THE DISCLOSURE A rifled projectile fuze having a head bolt with a core bushing and a centrifugal spiral. The structure includes a safety casing slidable on the bolt and a pill carrier-rotor which is engaged by the safety casing into the perforation.

This invention relates to a fuze for projectiles such as rifled projectile fuzes with head pin bolts.

It is known in connection with sensitive rifled projectile fuzes to provide safety means for the head pin bolt with a centrifugal spiral. Also it is known to provide safety means, in a charge carrier-rotor, against premature rotation in its acute position, so that the pin bolt upon firing will grip the rotor upon continuous return and to pass by. The pin bolt must thereby be under the influence of a supporting spring, which will pull it out of contact with the rotor after the firing impulse ceases.

During the centrifugal spiral first the transport safety means will be operating, so that the charge rotor carrier of the safety means will be extended to the prefiring and field safety procedure.

Usually the field safety means is attained by a clockwork mechanism. However, a clockwork mechanism will result in an expensive fuze construction. Thus the invention strives to omit the clockwork elements to attain a field safety device. This is attained in a simple manner in that the centrifugal spiral is utilized in addition to the opening of the pin bolt indirectly for opening the charge carrier rotor.

According to the invention, in the case of rifled projectile fuzes with head pin bolt, which is secured through the core sleeve of a centrifugal spiral, which relieves the bond of the bolt, in the case of the arrangement of a rotor carrier-pill the core bushing of the centrifugal spiral is loaded or weighted for advance through a safety casing which is slidable on the bolt and which is feed loaded by a spring, which with its rear end engages with a known dummy or blind hole in the pill carrier rotor. Advantageously, the casing will be round in cross section, while the dummy hole will have a square cross section.

Further objects will be apparent from the following description when considered in connection with the accompanying drawings in which:

FIGURE 1 is longitudinal section through the fuze,

FIG. 2 is a cross section taken on line 22 of FIG. 1 in the direction of the arrows,

FIG. 3 is a cross section taken on line 3-3 of FIG. 1 in the direction of the arrow,

FIG. 4 is a longitudinal section of a modified structure of the fuze in the safety position, and

FIG. 5 is a longitudinal section of the fuze of FIG. 4 in the non-safety position of the parts.

On the drawings and this description only those elements necessary for a complete understanding of the invention are illustrated and described.

By means of the reference character 10, there is shown a (two-part) headed needle pin bolt of a sensitive percussion fuze which, in known manner, is held in safety position by a spiral centrifugal band 11. This band is wound around a core bushing or case 12, which in known manner is composed of a thick profile band and upon winding up the band 11 by centrifugal force, ultimately the core bushing 12 is also wound up. The parts 10, 11 and 12 are mounted in a fuze head casing 17.

In the safety position of the centrifugal spiral band 11 projection or bundle 10a is provided on the pin 10 behind the wound up bushing 12 so that this will be safeguarded against back movement.

In the back part the fuze body is provided in known manner with a pill carrier-rotor 13 which is carried eccentrically relative to the ignition pill 14 which, in known manner, swings behind the pin bolt 10 during the period of safety in the weapon and in the field.

In known fuzes, the ignition pin of the head pin bolt upon firing is movable backward by the inertia in such a way that its rear end can penetrate in a blind bore in the pill carrier-rotor and a swing in the acute position will bet ied up. This is operative only for transport safety. In accordance with the invention; the transport safety device for pre-insertion of the projectile into the gun and field safety is increased. Ordinarily field safety is attained by a clockwork. Since, however, clockworks have expensive parts, it is advantageous to save on such parts.

For this purpose, the core or bushing 12 is loaded or weighted forward by a feed casing 16 which had been provided with a pressure spring 15, which feed casing is guided slidably on the bolt 10 and which is so long that it will dip a small distance into a dummy or blind hole 13a in the rotor 13. The casing 16 has a round cross section, while the dummy hole 13a in the rotor 13 has a square cross section. Therefore, in putting on the safety and taking it off, only line contact takes place, and a denting of the casing in the case of entering and leaving in and out of the rotor is no longer to be expected, whereby 'a source for misfiring or failure of the fuze is eliminated.

In the embodiment given by way of example and in accordance with FIG. 4, the cor bushing securing the bolt 101 has been replaced in the fly spiral 13 by two rings as fly-blocking balls 102, which are separated from each other by an intermediate disk, and on to which presses the feed casing 106, dipping into the pill carrierrotor 13 and which slides on the bolt 101 by the spring 105 and which presses into the casing opening 106.

The method of operation prolonging the safety of transportation to the safety before insertion in the barrel and it: the field, is the same as in the case of the first embodiment shown by way of example.

The feeding spring 15 or 105 for the safety casing 16 or 106 has been dimensioned in such a manner and has been built in with such a pre-tension that it abuts in its cocked position still with some stress against the shoulder of the bolt 10a or 101a, that the two parts of the bolt are in closing contact and the bolt-striking mushroom head 10b on its part is pressed in a waterproof manner against the holding flange 17a of the body of the fuze 17.

What is claimed is:

1. Rifled projectile fuze comprising a casing, a head bolt in the casing, said casing having a space therein through which the head bolt passes, a centrifugal spiral band mounted in the casing and around the head bolt, with a space within the spiral hand through which the head bolt passes, a pill carrier rotor mounted non-axially in the casing and having a perforation therein, a safety casing slidably mounted around the bolt and into which the bolt projects, means for placing the safety casing under spring action, and a feed spring for thebolt, said safety casing engaging with its end into the perforation in the pill carrier rotor. 2. Rified projectile fuze according to claim 1, in which the safety casing is round as to its cross section and the perforation has a square cross section.

3, Rified projectile fuze according to claim 1, in which the feed spring is dimensionedso that the safety'casing in its firingposition abuts against a shoulder on the bolt and is under tension, and in which thebolt is in two parts and are in close contact, the bolt having a mushroom head pressed in a waterproof manner against a holding flange in the fuze casing. s

4. Rifled projectile fuze according to claim 1 in which a plurality of balls are provided in the space withinsthe spiral band.

5. Rifled projectile fuze according to claim 1, in which a.. q e bu h ngi provided nthe pa .withinthe sp r l band.

References Cited UNITED STATES PATENTS 2,564,797 8/1951 1 Thompson" 102 79 2,748,708 6/1956 Bertram 2 102-79 2,938,463 5/1960 Jasse 102, 71 3,030,886 4/1962" Junghansetal.- 1021-79X 3,302,572 2/1957 Lindberg r a1. 02 79 FOREIGN PATENTS 280,859 1/1928 GreatBritain f BENJAMIN A. BORCHELT, Primary Examiner 

